refactor(ui) : improve styling, layout and responsive across all components

Rework CSS theme (app.css), navbar layout, dashboard page, machine detail,
catalog pages, and various form/display components for better consistency
and mobile responsiveness.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/components/sites/SiteEditModal.vue

@@ -3,7 +3,7 @@
     <div class="modal-box max-w-md">
       <h3 class="font-bold text-lg mb-4">
         {{ disabled ? 'Détails du site' : 'Modifier le site' }}
-        <span v-if="siteName" class="block text-sm font-normal text-gray-500">{{ siteName }}</span>
+        <span v-if="siteName" class="block text-sm font-normal text-base-content/50">{{ siteName }}</span>
       </h3>
       <form class="space-y-4" @submit.prevent="emit('submit')">
         <div class="form-control">
@@ -28,7 +28,7 @@
               <h4 class="font-semibold text-sm">
                 Documents liés
               </h4>
-              <p class="text-xs text-gray-500">
+              <p class="text-xs text-base-content/50">
                 Ajoutez des documents (PDF, images...) relatifs à ce site.
               </p>
             </div>
@@ -74,7 +74,7 @@
                     <div class="font-medium">
                       {{ document.name }}
                     </div>
-                    <div class="text-xs text-gray-500">
+                    <div class="text-xs text-base-content/50">
                       {{ document.mimeType || 'Inconnu' }} • {{ formatSize(document.size) }}
                     </div>
                   </div>